Footer Social Icons - Remove padding?

Hi again. I'm trying to remove the padding from the social icons/links in my footer but I'm having trouble targeting them. I tried targeting the social block ID but that didn't work. I'm able to find information on targeting the header social icons but not the footer.. Thanks in advance. 

Website: shuifeng.squarespace.com

Edit: I was able to make it work by reducing the size of the social icons from medium to small, which removes the padding. But I'd prefer to use the medium social icons. How can I make this work?

Awesome. Thank you @tuanphan!